Heater



FIG. 1 is a front, right, top perspective view of a heater;

FIG. 2 is a front, left, top perspective view of the heater of FIG. 1;and,

FIG. 3 is a front elevation view of the heater of FIG. 1.

The broken lines represent portions of the structure that form no partof the claim.

CLAIM The ornamental design for heater, as shown and described.